I have to say Machform is a great tool! It will be nice if it has more enterprise features. I guess people don't mind to pay more.
1) SAML or OIDC for authentication and attribute sharing
2) Approvers list from Active Directory or from the attributes from the IDP (e.g. SAML or OIDC)
3) Audit Trail and Dashboard on the workflow status (e.g. incomplete workflow)
4) Support more payment gateway, such as, Alipay or WeChat pay.